Method find

chapter06/src/main/java/com/seaofnodes/simple/node/Node.java:404–404

Debugging utility to find a Node by index

(int nid)

     * Debugging utility to find a Node by index
     */
    public Node find(int nid) { return _find(new BitSet(),nid); }
    private Node _find(BitSet visit, int nid) {
        if( _nid==nid ) return this;
        if( visit.get(_nid) ) return null;